Nonlinear analysis of the electroretinogram



To investigate the early steps in visual processing we turned to the flicker ERG.   We showed that the retina can respond to flicker well about 150 Hz (large fields) and that the nonlinear response components went much higher in frequency.  We analyzed the ERG using a two-sine wave technique where the presence of a nonlinear response component would cause responses at the sum and difference frequencies.  Thus, we could measure the early filter response of the retina, which showed very little light adaption, as well as how and where cones converged their inputs.


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